Revert "Jenkinsfile run both jdk 7 and 8"
Revert "Jenkinsfile run both jdk 7 and 8"

The hpi maven mojo seems to not be runnable in ldk 7 any more
This reverts commit 4b0a8543f251ed8736690b57589b62ea72422bd8.

maksonlee/repo-plugin,jenkinsci/repo-plugin,Typz/repo-plugin,Typz/repo-plugin,jenkinsci/repo-plugin,maksonlee/repo-plugin